3 replies [Last post]
R26
R26's picture
 Offline
NorCal
Joined: 10/13/2012
Posts: 88

Hello

Quick question for the group. Using an electronic ignition such as the powerdynamo. What is the best way to isolate the ignition on one cylinder while adjusting the carbs ? Want to make sure that I won't fry the electronics.....

schrader7032
schrader7032's picture
 Offline
VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6327
Two approaches. One would be

Two approaches. One would be to use the EMPI gages as talked about on this forum. There might be other devices that do something similar. The other approach would be to use a shorting method. Done properly, it shouldn't harm the ignition. You would need something that can be screwed into the top of the spark plug and allows the spark plug cap to be placed on the other end of it. For example, a small piece of threaded rod with a spark plug nut on the end of it (these nuts usually come already on the plug...typically they're taken off and thrown away). With the extension in place, this gives you a spot to use a plastic handled screwdriver to short across the extension to send the voltage to the engine fins. The screwdriver is placed against the engine in a way that allows you to easily move the shank of the screwdriver onto the extension. The voltage follows the path of the screwdriver to ground instead of going into the plug to jump the gap to ground. Short a cylinder out and make adjustments as needed to the running cylinder. Release the screwdriver and short the other cylinder out...make any adjustments.

The EMPI might be the better way to go...it has less impact or less chance of making a mistake.

__________________

Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

R26
R26's picture
 Offline
NorCal
Joined: 10/13/2012
Posts: 88
Thanks Kurt !

I managed to isolate the problem. It appears as the right carburetor is misbehaving. Not enough air is coming thought the idle circuit. Instead I have to raise the slide to make the cylinder produce any power. Can't figure out why. Cleaned all the air and gas passages, swap components, jets are the correct size, checked compression, valves, ignition....

R26
R26's picture
 Offline
NorCal
Joined: 10/13/2012
Posts: 88
Update

Here it is. Pretty much run out of areas to look for trouble. One area that didn't pay much attention since the carby rebuilt was float valve seat. This morning I took the right side float and needle (old style) out and gave it the valve grinding compound treatment. Huge improvement. All is well Smile

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.